-
Notifications
You must be signed in to change notification settings - Fork 4.6k
/
router.go
144 lines (122 loc) · 3.3 KB
/
router.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
package router
//go:generate errorgen
import (
"context"
"v2ray.com/core"
"v2ray.com/core/common"
"v2ray.com/core/common/session"
"v2ray.com/core/features/dns"
"v2ray.com/core/features/outbound"
"v2ray.com/core/features/routing"
)
func init() {
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
r := new(Router)
if err := core.RequireFeatures(ctx, func(d dns.Client, ohm outbound.Manager) error {
return r.Init(config.(*Config), d, ohm)
}); err != nil {
return nil, err
}
return r, nil
}))
}
// Router is an implementation of routing.Router.
type Router struct {
domainStrategy Config_DomainStrategy
rules []*Rule
balancers map[string]*Balancer
dns dns.Client
}
// Init initializes the Router.
func (r *Router) Init(config *Config, d dns.Client, ohm outbound.Manager) error {
r.domainStrategy = config.DomainStrategy
r.dns = d
r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
for _, rule := range config.BalancingRule {
balancer, err := rule.Build(ohm)
if err != nil {
return err
}
r.balancers[rule.Tag] = balancer
}
r.rules = make([]*Rule, 0, len(config.Rule))
for _, rule := range config.Rule {
cond, err := rule.BuildCondition()
if err != nil {
return err
}
rr := &Rule{
Condition: cond,
Tag: rule.GetTag(),
}
btag := rule.GetBalancingTag()
if len(btag) > 0 {
brule, found := r.balancers[btag]
if !found {
return newError("balancer ", btag, " not found")
}
rr.Balancer = brule
}
r.rules = append(r.rules, rr)
}
return nil
}
func (r *Router) PickRoute(ctx context.Context) (string, error) {
rule, err := r.pickRouteInternal(ctx)
if err != nil {
return "", err
}
return rule.GetTag()
}
func isDomainOutbound(outbound *session.Outbound) bool {
return outbound != nil && outbound.Target.IsValid() && outbound.Target.Address.Family().IsDomain()
}
func (r *Router) resolveIP(outbound *session.Outbound) error {
domain := outbound.Target.Address.Domain()
ips, err := r.dns.LookupIP(domain)
if err != nil {
return err
}
outbound.ResolvedIPs = ips
return nil
}
// PickRoute implements routing.Router.
func (r *Router) pickRouteInternal(ctx context.Context) (*Rule, error) {
outbound := session.OutboundFromContext(ctx)
if r.domainStrategy == Config_IpOnDemand && isDomainOutbound(outbound) {
if err := r.resolveIP(outbound); err != nil {
newError("failed to resolve IP for domain").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
}
for _, rule := range r.rules {
if rule.Apply(ctx) {
return rule, nil
}
}
if r.domainStrategy != Config_IpIfNonMatch || !isDomainOutbound(outbound) {
return nil, common.ErrNoClue
}
if err := r.resolveIP(outbound); err != nil {
newError("failed to resolve IP for domain").Base(err).WriteToLog(session.ExportIDToError(ctx))
return nil, common.ErrNoClue
}
// Try applying rules again if we have IPs.
for _, rule := range r.rules {
if rule.Apply(ctx) {
return rule, nil
}
}
return nil, common.ErrNoClue
}
// Start implements common.Runnable.
func (*Router) Start() error {
return nil
}
// Close implements common.Closable.
func (*Router) Close() error {
return nil
}
// Type implement common.HasType.
func (*Router) Type() interface{} {
return routing.RouterType()
}